There's no server browser and every game is organized through a matchmaking process. The game itself is then hosted on a dedicated server instead of by one of the players' computers.

Which, for a game like this, is great. It's quick and dumb fun, and when I want quick and dumb fun, I don't want to sift through a bunch of servers running 24/7 nuketown only for the first seemingly vanilla server I find to be "NO STANDING TACTICAL REALISM."